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SysCall: Made SMEP, SMAP, PAN optional features.

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This commit is contained in:
Mikhail Krichanov 2024-09-02 12:19:00 +03:00
parent 940a7e2074
commit 5b59ec5e07
4 changed files with 26 additions and 31 deletions
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11
MdeModulePkg/Core/Dxe/SysCall/AARCH64/InitializeMsr.c
View File

@ -173,9 +173,6 @@ InitializeMsr (
// Enable Privileged Access Never feature. // Enable Privileged Access Never feature.
// //
ArmSetPan (); ArmSetPan ();
} else {
DEBUG ((DEBUG_ERROR, "Core: Failed to initialize MSRs for Ring3.\n"));
ASSERT (FALSE);
} }
InitializeSysCallHandler ((VOID *)SysCallBootService); InitializeSysCallHandler ((VOID *)SysCallBootService);
@ -187,7 +184,9 @@ DisableSMAP (
VOID VOID
) )
{ {
ArmClearPan (); if (ArmHasPan ()) {
ArmClearPan ();
}
} }
VOID VOID
@ -196,7 +195,9 @@ EnableSMAP (
VOID VOID
) )
{ {
ArmSetPan (); if (ArmHasPan ()) {
ArmSetPan ();
}
} }
EFI_STATUS EFI_STATUS

6
MdeModulePkg/Core/Dxe/SysCall/ARM/InitializeMsr.c
View File

@ -105,12 +105,6 @@ InitializeMsr (
// Enable Privileged Access Never feature. // Enable Privileged Access Never feature.
// //
ArmSetPan (); ArmSetPan ();
} else {
//
// TODO: Refactoring.
//
DEBUG ((DEBUG_ERROR, "Core: Failed to initialize MSRs for Ring3.\n"));
// ASSERT (FALSE);
} }
InitializeSysCallHandler (SysCallBootService); InitializeSysCallHandler (SysCallBootService);

19
MdeModulePkg/Core/Dxe/SysCall/IA32/InitializeMsr.c
View File

@ -27,14 +27,9 @@ InitializeMsr (
// //
// Forbid supervisor-mode accesses to any user-mode pages. // Forbid supervisor-mode accesses to any user-mode pages.
// SMEP and SMAP must be supported.
// //
AsmCpuidEx (0x07, 0x0, NULL, &Ebx, NULL, NULL); AsmCpuidEx (0x07, 0x0, NULL, &Ebx, NULL, NULL);
// if (((Ebx & BIT20) != 0) && ((Ebx & BIT7) != 0)) {
// SYSENTER and SYSEXIT must be also supported.
//
AsmCpuidEx (0x01, 0x0, NULL, NULL, NULL, &Edx);
if (((Ebx & BIT20) != 0) && ((Ebx & BIT7) != 0) && ((Edx & BIT11) != 0)) {
Cr4.UintN = AsmReadCr4 (); Cr4.UintN = AsmReadCr4 ();
Cr4.Bits.SMAP = 1; Cr4.Bits.SMAP = 1;
Cr4.Bits.SMEP = 1; Cr4.Bits.SMEP = 1;
@ -43,9 +38,15 @@ InitializeMsr (
Eflags.UintN = AsmReadEflags (); Eflags.UintN = AsmReadEflags ();
Eflags.Bits.AC = 0; Eflags.Bits.AC = 0;
AsmWriteEflags (Eflags.UintN); AsmWriteEflags (Eflags.UintN);
} else { }
DEBUG ((DEBUG_ERROR, "Core: Failed to initialize MSRs for Ring3.\n"));
ASSERT (FALSE); //
// SYSENTER and SYSEXIT must be supported.
//
AsmCpuidEx (0x01, 0x0, NULL, NULL, NULL, &Edx);
if ((Edx & BIT11) == 0) {
DEBUG ((DEBUG_ERROR, "Core: SYSENTER and SYSEXIT are not supported.\n"));
CpuDeadLoop ();
} }
// //

21
MdeModulePkg/Core/Dxe/SysCall/X64/InitializeMsr.c
View File

@ -28,14 +28,9 @@ InitializeMsr (
// //
// Forbid supervisor-mode accesses to any user-mode pages. // Forbid supervisor-mode accesses to any user-mode pages.
// SMEP and SMAP must be supported.
// //
AsmCpuidEx (0x07, 0x0, NULL, &Ebx, NULL, NULL); AsmCpuidEx (0x07, 0x0, NULL, &Ebx, NULL, NULL);
// if (((Ebx & BIT20) != 0) && ((Ebx & BIT7) != 0)) {
// SYSCALL and SYSRET must be also supported.
//
AsmCpuidEx (0x80000001, 0x0, NULL, NULL, NULL, &Edx);
if (((Ebx & BIT20) != 0) && ((Ebx & BIT7) != 0) && ((Edx & BIT11) != 0)) {
Cr4.UintN = AsmReadCr4 (); Cr4.UintN = AsmReadCr4 ();
Cr4.Bits.SMAP = 1; Cr4.Bits.SMAP = 1;
Cr4.Bits.SMEP = 1; Cr4.Bits.SMEP = 1;
@ -44,15 +39,19 @@ InitializeMsr (
Eflags.UintN = AsmReadEflags (); Eflags.UintN = AsmReadEflags ();
Eflags.Bits.AC = 0; Eflags.Bits.AC = 0;
AsmWriteEflags (Eflags.UintN); AsmWriteEflags (Eflags.UintN);
// }
// Enable SYSCALL and SYSRET.
// //
// Enable SYSCALL and SYSRET.
//
AsmCpuidEx (0x80000001, 0x0, NULL, NULL, NULL, &Edx);
if ((Edx & BIT11) != 0) {
MsrEfer.Uint64 = AsmReadMsr64 (MSR_IA32_EFER); MsrEfer.Uint64 = AsmReadMsr64 (MSR_IA32_EFER);
MsrEfer.Bits.SCE = 1; MsrEfer.Bits.SCE = 1;
AsmWriteMsr64 (MSR_IA32_EFER, MsrEfer.Uint64); AsmWriteMsr64 (MSR_IA32_EFER, MsrEfer.Uint64);
} else { } else {
DEBUG ((DEBUG_ERROR, "Core: Failed to initialize MSRs for Ring3.\n")); DEBUG ((DEBUG_ERROR, "Core: SYSCALL and SYSRET are not supported.\n"));
ASSERT (FALSE); CpuDeadLoop ();
} }
// //